A scallywag stiffarm the act of taking your arm and yelling "SCALLYWAG" and pushing that bitches face away from you. you first put ur hand infront of your face, and the make the cry, and then push her away.
It is the most effective way to get rid of a scallywag.

Matt: man that scallywag Amanda wouldn't step out of my shit bro. Asking me where I am, who I'm with, and why i smell like this.
Stephen: where is she now she usually following u around.

Matt: I gave the Scallywag Stiffarm bro. You think she will be back.
Stephen: Not after a good ole Scallywag Stiffarm